The U.S. cyclosporiasis outbreak has grown to 15,716 laboratory-confirmed domestically acquired cases, making the parasitic illness one of the most significant foodborne disease events in recent U.S. history. The Centers for Disease Control and Prevention says 828 people have been hospitalized and two have died, with confirmed cases reported across 47 states plus the District of Columbia and Puerto Rico as of Aug. 17.
The latest total represents an increase of 1,821 confirmed cases in one week. CDC is also aware of at least 11,841 additional cases that remain unconfirmed or require further investigation to establish whether they were acquired domestically, meaning the official count may continue rising even as some state officials see signs that new infections are slowing.
Cyclosporiasis Outbreak Includes Recalled Lettuce Cases
A substantial portion of the 2026 increase is tied to an outbreak involving processed iceberg lettuce supplied by Taylor Farms de Mexico. CDC and FDA traceback work linked shredded lettuce served at certain Taco Bell locations to the supplier, and Taylor Farms de Mexico subsequently removed iceberg lettuce sourced from central Mexico from the U.S. market.
The recall included food-service products and Marketside-branded iceberg salad and shredded lettuce sold through Walmart with specified July and early-August use-by dates. Those recalled products are distinct from every package of lettuce currently on store shelves, so consumers should rely on the specific FDA recall information rather than assuming all iceberg lettuce is contaminated.
The known lettuce outbreak has expanded to 17 states and includes thousands of illnesses, with Michigan particularly hard hit. CDC stresses, however, that its national total also includes cases outside that specific outbreak.
Six Other Clusters Still Have No Confirmed Source
The iceberg lettuce investigation does not explain every case. CDC and FDA are investigating at least six additional cyclosporiasis clusters for which a food source has not yet been confirmed, making it important not to attribute every 2026 infection to Taylor Farms or Taco Bell.
That distinction is essential both for public health and basic fairness. Investigators use interviews, traceback records, laboratory data and patterns across cases to identify common exposures, and an unresolved cluster should remain unresolved until the evidence supports a specific source.
The agency’s national surveillance numbers are also different from some state totals. CDC notes that states may report higher counts because their definitions and processing may include cases that do not yet satisfy the federal surveillance criteria.
Symptoms Can Persist Without Treatment
Cyclosporiasis is an intestinal infection caused by the microscopic parasite Cyclospora. The most common symptom is watery diarrhea, with other possible symptoms including loss of appetite, weight loss, stomach cramps, bloating, nausea and fatigue.
CDC advises people with symptoms, particularly prolonged watery diarrhea, to contact a healthcare provider and mention the possibility of Cyclospora because testing is not automatically included in every routine laboratory examination. The CDC identifies trimethoprim-sulfamethoxazole, commonly abbreviated TMP-SMX, as the treatment of choice for diagnosed cyclosporiasis.
People should seek individual medical guidance rather than self-treating, particularly if they have medication allergies or other health conditions. Maintaining adequate fluids is also important when prolonged diarrhea creates a dehydration risk.
CDC Says Washing Helps but Does Not Eliminate Risk
CDC recommends washing fruits and vegetables thoroughly under running water before eating, cutting or cooking them. Firm produce can be scrubbed with a clean produce brush, but the agency warns that washing alone cannot guarantee removal of Cyclospora.
Cooking can kill the parasite, and CDC says produce heated to at least 158 degrees Fahrenheit, or 70 degrees Celsius, can eliminate it. Consumers should also continue monitoring FDA and CDC recall notices rather than abandoning fresh produce altogether.
The current outbreak has already affected consumer confidence in lettuce and other produce. That reaction is understandable, but broad avoidance of foods that have not been implicated can punish growers and retailers without meaningfully reducing risk.
Investigation Must Identify the Remaining Sources
The scale of the outbreak demands transparency from regulators and food suppliers. The confirmed case count is more than 13 times the 1,180 domestically acquired cases CDC recorded between May 1 and Aug. 31 last year, showing how unusual the 2026 season has become.
The government also has to distinguish confirmed findings from unresolved suspicions. Taylor Farms de Mexico has been linked to the major iceberg lettuce outbreak through traceback evidence, while at least six other clusters remain under investigation and should not be attributed prematurely.
For consumers, the practical response is narrower than avoiding every salad or restaurant. Check active recalls, wash produce, monitor symptoms and seek medical evaluation for persistent gastrointestinal illness, while CDC and FDA continue working to determine why the 2026 cyclosporiasis season became so much larger than normal.
